Yoshiaki Hori

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In a society preoccupied with gradual erosion of electronic privacy, loss of privacy in current DNS queries is an important issue worth considering. From the definition, the privacy problem is to prove that none of the private data can be inferred from the information which is made public. The privacy disclosure problem in DNS Query was well analyzed by(More)
Considering the fact that P2P (Peer-to-Peer) systems are self-organized and autonomous, social-control mechanism (like trust and reputation) is essential to evaluate the trustworthiness of participating peers and to combat the selfish, dishonest and malicious peer behaviors. So, naturally, we advocate that P2P systems that gradually act as an important(More)
Various new transport protocols have been proposed with the aim of the efficient use of abundant resources in fast long-distance networks, and a number of experiments to investigate the performances of those protocols have already been reported. However, they have mainly focused on the throughput characteristics of a single connection or under a stable(More)
Recently, botnet becomes a social problem due to the expansion of bot infection. Ideally, all the vulnerable computers should be fortified to counteract laying malware. Accordingly, it is important to implement an information system which detects bot-infected computers and alerts them. In this paper, we focused on bots using IRC to communicate, and examined(More)
In this paper we compare four risk analysis methods: Mehari, Magerit, NIST800-30 and Microsoft's Security Management Guide. Mehari is a method for risk analysis and risk management developed by CLUSIF (Club de la Securite del' Information Francais). Magerit is a risk analysis and management methodology for information systems developed by CSAE (Consejo(More)
Two congestion control schemes designed specifically to handle changes in the datalink interface of a mobile host are presented. The future mobile environment is expected to involve multimode connectivity to the Internet and dynamic switching of the connection mode depending on network conditions. The conventional Transmission Control Protocol (TCP),(More)